General secretary Mick Cash said: “This has been yet another grim 24 hours for London commuters. RMT has warned repeatedly that cuts to staffing, budgets and maintenance on both tube and rail has left services permanently on a knife edge and last night and this morning we have seen what that means in practice.

“RMT shares the anger and frustration of passengers caught up in this shambles and the union will continue to fight for a reversal of the cuts programme which threatens public safety as demand continues to surge.”